Rodent monitoring apparatus

Details Rodent monitoring apparatus Rodent monitoring apparatus

1988-09-07

1990-02-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502222, G01V 904

Patent

active

049028901

ABSTRACT:
A rodent monitoring apparatus comprises a passageway defined by a horizontal member and two vertical members, an infrared light beam directed across the passageway, and an electronic counter circuit configured to monitor the number of times the light beam is interrupted.

REFERENCES:
patent: 3040980 (1962-06-01), Mann et al.
patent: 3436540 (1969-04-01), Lamorlette
patent: 3752978 (1973-08-01), Kahl, Jr.
patent: 3782334 (1974-01-01), Leon
patent: 3925681 (1975-12-01), Grudelbach
patent: 4278878 (1981-07-01), Kato
patent: 4347438 (1982-08-01), Spielman
patent: 4356387 (1982-10-01), Tsubota
patent: 4373471 (1983-02-01), Coulbourn
patent: 4448150 (1984-05-01), Catsimpoolas
patent: 4635215 (1987-01-01), Friend

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